Yeah, I've never found one that honors 00-7F ASCII... that space seems to generally be occupied by control codes.
Thanks for the advice, I'll give it a try first. If it's not going to require massive intervention to get skill names, etc. to 16 characters instead of 8 then it's definitely worth a shot, and it's true that 8-bit conversion is still an option if it doesn't work. There are relative pointers all over the place, though, so I'm not looking forward to fixing those when the text size blows up.